Jig.



G. H. ELMORE.

JIG.

APPLICATION FILED JULY 2, 1913.

Patented Mar. 16, 1915.

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w oj lifiy f a. H. ELMORE.

' JIG.

APPLIGATION FILED JULY 2, 1913.

Patented Mar. 16, 1915.

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Elmore,

rrED STATES FATE OFFICE...

GUY H. ELMORE, OF SWARTHMORE, PENNSYLVANIA.

JIG.

Be it known that I, GUY H. ELMORE, a citizen of the United States,residing at Swarthmore, in the county of Delaware and State ofPennsylvania, have invented certain new and useful Improvementsin Jigs,of which the following is a specification.

This invention relates to jigs and particularly to a mechanism forcontrolling the operation of the discharge valve thereof to maintain apractically constant depth of bed in the jig.

The device is in the nature of an imrovement of that shown in my priorPatent 0. 997,609, granted July 11, 1911, and involves certainimprovements in the arrangement of the float and contact mechanism, aswell as the elimination of the clutch mechanism formerly used and thesubstitution for the valve drive-ratchets.

The details of the construction are shown applied to a jig intended forjigging coal, in the drawings, wherein Figure 1 is a vertical sectionthrough a jig with my invention applied; Fi 2 is an elevation of a partof the side of the jig, the ratchet valve-driving mechanism being shownpartly in section; Fig. 3 is an elevatherefor of a magnetic disengagingdevice tion, partly sectional, of the end of the jig,

showing the ratchet valve-driving mechanism and the float and switch.mechanism; Fig. 4 is an enlarged sectional view of the float switchmechanism and the magnetic pawl throwout, with the wiring and themagnetic relay switch shown in diagram; ind Fig. 5 is a section on theline ,55 of In the drawings 1 represents the jig tank, 2 the plunger, 3the driving mechanism for the plunger, 4 the screen, 5 the overflow forthe lighter materials, and 6 the discharge valve for the heaviermaterials. The particular form of this valve is not a matter of vitalimportance so far as the operation of the controlling device,isconcerned, but I have chosen for purposes of illustration the valvedescribed and claimed in my copending application, Serial No. 715,080,filed August 14, 1912. Consequently no claims are made herein to theform of the valve.

Specification of Letters Patent.

Application filed July 2, 191's. Serial No. 776,986.

The valve 6 consists of a rotatable cylindrical bar having longitudinalgrooves or ports in the periphery. The valve fits closely betweensealing plates 7 and 8, the plate 7 forming the overflow for the heavymaterial from the jig and the plate 8 being adjustable to secure atightsealing action. As the valve rotates it carries in its grooves or portssolid material mixed with water from the jig but does not permit thefree outflow of water.

The valve is rotated by a shaft 9 which extends through a stufiing box10 and carries a ratchet wheel 11. J ournaled on shaft 9 and straddlingratchet 11 is a bifurcated yoke or lever 12 carrying the pawls 13unequal in length and adapted individually to engage the teeth inratchet 11. The pawls 13 have rearward extensions 14, which nearlybalance them so that only slight force is necessary to hold them up. Thepawls are made of bronze so as to have no magnetic attraction forratchet 11 but. carry iron inserts or armatures 15, and in cooperativerelation with these inserts are magnets 16 hood 17, as shown.

The yoke 12 1s rocked by a. connecting rod 18 connected to crank 19 onshaft 20 which shaft is constantly driven by any suitable means duringthe operation of the-jig. The range of throw of the yoke 12 may beadjusted by clamping connecting rod bearing 21 in various adjustedpositions in slots 22 on the yoke 12. Y

The pawls 13 in riding over the teeth are lifted nearly into contactwith magnets 16 and if these magnets be energized the pawls are held upin disengaged position. When the magnets are deenergized they drop downinto operative position. Thus valve 6 is operated only when magnets 16are deenergized.

The float switch mechanism is carried on a bracket 23 bolted to the sideof the jig as shown. The switch mechanism is inclosed in case or box 24'having a removable top cover 25 and a removable side cover 26 of theforms clearly shown in the drawings. The case 21 is carried on a stem 27vertically adjustable in bracket 23 and formed intethe float on top ofthe proper stratum of material in the jig. The rod 31 carries a bracket33 with resiliently mounted contact balls 34 which may bridge in theopposite limitin positions of the float either of two pairs 0 concentriccontact rings 35, 36 and 37 38. The rings 35 and 36 are carried on aninsulating plate 39 and the rings 37 and 38 on a similar plate 40. Theplates 39 and 40 are suspended in properly spaced relation frompartition 29 by the rods 41.

Thus in the uppermost position of the float rings 35 and 36 areelectrically connected while in the lowermost position rings 37 and 38are connected.

In connection with the mechanism so far described I make use of amagnetic relay switch consisting of the sliding bar 42 adapted to carrycontact 43 into and out of contact with fixed contact 44. The bar 42carries armatures 45 which are alternately attracted in oppositedirections by two pairs of electric magnets 46 and 47.

A dynamo or other suitable source of current 48 has one terminalconnected to ring 35, ring 38 and one terminal of magnets 16. The otherterminal of source48 is connected to one terminal of magnets 46, oneterminal of magnets 48 and to contact 44. The second terminal of magnets16 is connected to contact 43 and the second terminals of magnets 46 and47 are res ectively connected to rings 36- and 37 (see Fig. 4).

Thus when the float rises to its highest position rings 35 and 36 areelectrically connected. Current then flows through magnet 46 drawingarmatures 45 to'the left and disconnecting contacts 43 and 44. Thisdeenergizes magnets 16 releasing pawls 13 which drop into operativeposition driving the jig valve 6. This will gradually lower the level ofthe bed until float 32 has reached its lowest position and electricallyconnects rings 37 and 38. This energizes magnets 47, drawing armatures45 to the right connecting contacts 43 and 44 to energize magnets 16 andhold pawls 13 out of action. Throu hout nearly the entire action,magnets 46 and 47 will be deenergized while magnets 16 are energized foronly limited periods. This results in a decided saving of current, andbecause of the simple throwout device used only a light current need be1,1ea,ece

' valve into and. out of action is substantially the same as that of myprior patented structure but the ease of'manufacture and economy in theuse of electrical current give the present device certain commercialadvanta es.

aving thus described my inventiomwhat 1 claim is 1. The combination witha jig having a screen and a discharge valve located adjacent saidscreen, of a ratchet wheel adapted to drive said valve; alever; meansfor oscillating said lever; a pawl carried by said lever and adapted toengage the teeth on said ratchet wheel to drive the same; anelectro-magnet adapted when energized to hold said pawl away from saidratchet wheel; a float adapted to rest in material on. said screen; anda circuit closing device connected with .the float and adapted to beactuated by the rise and fall thereof and interposed in the circuitthrough said magnet to control the same. I

2. The combination with a jig having a, screen and a discharge valvelocated adjacent said screen, of a ratchet wheel adapted to drive saidvalve; a lever: means for oscillating said lever; a plurality of pawlscarried by said lever and adapted individually to engage the teeth onsaid ratchet to drive the same: electro-magnets adapted when energizedto hold said pawls away from said ratchet wheel: a float adapted to restin material on said screen: vand a circuit closing device connected withthe float and adapted to be actuated by the rise and fall thereof andinterposed in the circuit through said electro-maenets to control thesame.

3. An electro-magnetic throw-out device for jigs provided with a rotarydischarge valve and a float controlled circuit closer, comprising incombination. a ratchet wheel in driving relation with said dischargevalve, a rocker arm mounted coaxially with said ratchet wheel, a pawlcarried by said rocker arm and adapted to engage said ratchet wheel, anelectro-magnet carried by said rocker arm and adapted to hold said pawlout of en aging relation with said ratchet wheel, driving connectionsfor rocking said rocker arm. and suitable electric connections from saidelectro-magnet to the float controlled circuit closer.

4. The combination with discharge valve drive mechanism for jigs,including a ratchet, a rocker arm and a pawl carried by said rocker armto engage said ratchet; of In testimony whereof I have signed xny anelectro-x nagnet earned by said rocker name to this specification in thepresence of arm and" adapted to withhold said pawl two subscribingwitnesses.

from engaging relation with said ratchet; GUY H. ELMORE. 5 and suitableelectrlcal connections for said Witnesses:

magnet to permit it to be energized and 'de- HORACE A. Down,-

energized to retract and release said pawl. BENNE'I'I' S. JONES.

